Accumulated Other Comprehensive Income (Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (158,844)	$ (107,767)	$ (49,498)
Other comprehensive income/(loss) before reclassifications	(23,163)	(53,013)	(55,902)
Pension/postretirement settlements and curtailments	45	103	5,167
Pension/postretirement plan remeasurement	(4,394)	(622)	(9,265)
Interest expense related to swaps reclassified to the Statement of Income, net of tax	1,488	1,233	1,168
Pension and postretirement liability adjustments reclassified to Statement of Income, net of tax	679	1,222	563
Net current period other comprehensive income	(25,345)	(51,077)	(58,269)
Ending balance	(184,189)	(158,844)	(107,767)
Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(108,655)	(55,240)	(138)
Other comprehensive income/(loss) before reclassifications	(24,643)	(53,415)	(55,102)
Pension/postretirement settlements and curtailments
Pension/Postretirement plan change in benefits
Pension/postretirement plan remeasurement
Interest expense related to swaps reclassified to the Statement of Income, net of tax
Pension and postretirement liability adjustments reclassified to Statement of Income, net of tax
Net current period other comprehensive income	(24,643)	(53,415)	(55,102)
Ending balance	(133,298)	(108,655)	(55,240)
Pension and Postretirement Liability Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(48,725)	(51,666)	(48,383)
Other comprehensive income/(loss) before reclassifications	676	2,238	252
Pension/postretirement settlements and curtailments	45	103	5,167
Pension/postretirement plan remeasurement	(4,394)	(622)	(9,265)
Interest expense related to swaps reclassified to the Statement of Income, net of tax
Pension and postretirement liability adjustments reclassified to Statement of Income, net of tax	679	1,222	563
Net current period other comprehensive income	(2,994)	2,941	(3,283)
Ending balance	(51,719)	(48,725)	(51,666)
Derivative Valuation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,464)	(861)	(977)
Other comprehensive income/(loss) before reclassifications	804	(1,836)	(1,052)
Pension/postretirement settlements and curtailments
Pension/postretirement plan remeasurement
Interest expense related to swaps reclassified to the Statement of Income, net of tax	1,488	1,233	1,168
Pension and postretirement liability adjustments reclassified to Statement of Income, net of tax
Net current period other comprehensive income	2,292	(603)	116
Ending balance	$ 828	$ (1,464)	$ (861)